Dell OptiPlex 755 User's Guide - Page 168
Removing the Computer Cover
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3 network adapter connector To attach your computer to a network or broadband device, connect one end of a network cable to either a network jack or your network or broadband device. Connect the other end of the network cable to the network adapter connector on the back panel of your computer. A click indicates that the network cable has been securely attached. NOTE: Do not plug a telephone cable into the network connector. For VPro to work, the network cable must be connected to the onboard NIC. It is recommended that you use Category 5 wiring and connectors for your network. If you must use Category 3 wiring, force the network speed to 10 Mbps to ensure reliable operation. 4 network activity light Flashes a yellow light when the computer is transmitting or receiving network data. A high volume of network traffic may make this light appear to be in a steady "on" state. 5 line-out connector Use the green line-out connector (available on computers with integrated sound) to attach headphones and most speakers with integrated amplifiers. 6 line-in/microphone connector Use the blue and pink line-in/microphone connector (available on computers with integrated sound) to attach a record/playback device such as a cassette player, CD player, or VCR; or a personal computer microphone for voice or musical input into a sound or telephony program. 7 USB 2.0 connectors (6) Use the back USB connectors for devices that typically remain connected, such as printers and keyboards. 8 video connector Plug the cable from your VGA-compatible monitor into the blue connector. NOTE: If you purchased an optional graphics card, this connector will be covered by a cap. Connect your monitor to the connector on the graphics card. Do not remove the cap. NOTE: If you are using a graphics card that supports dual monitors, use the y-cable that came with your computer. 9 serial connector Connect a serial device, such as a handheld device, to the serial port. For more information, see "System Setup Options" on page 281. Removing the Computer Cover CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the computer cover. 1 Follow the procedures in "Before You Begin" on page 21. 2 If you have installed a padlock through the padlock ring on the back panel, remove the padlock. 3 Locate the cover release latch shown in the illustration. Then, slide the release latch back as you lift the cover. 168 Small Form Factor Computer